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38 lines
807 B
C
38 lines
807 B
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "sdkconfig.h"
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#include "esp_private/systimer.h"
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/**
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* @brief systimer's clock source is fixed to XTAL (40MHz/26MHz), and has a fixed fractional divider (2.5).
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* So the resolution of the systimer is 40MHz/2.5 = 16MHz, or 26MHz/2.5 = 10.4MHz.
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*/
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#if CONFIG_XTAL_FREQ_40
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uint64_t systimer_ticks_to_us(uint64_t ticks)
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{
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return ticks / 16;
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}
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uint64_t systimer_us_to_ticks(uint64_t us)
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{
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return us * 16;
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}
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#elif CONFIG_XTAL_FREQ_26
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uint64_t systimer_ticks_to_us(uint64_t ticks)
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{
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return ticks * 5 / 52;
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}
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uint64_t systimer_us_to_ticks(uint64_t us)
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{
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return us * 52 / 5;
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}
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#else
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#error "Unsupported XTAL frequency by systimer"
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#endif // CONFIG_XTAL_FREQ_xx
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